Ultrasound assisted lipase catalyzed synthesis of poly-6-hydroxyhexanoate

Gumel, A.M. and Annuar, M.S.M. and Heidelberg, T. and Chisti, Y. (2012) Ultrasound assisted lipase catalyzed synthesis of poly-6-hydroxyhexanoate. Ultrasonics Sonochemistry, 19 (3). pp. 659-667.

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Abstract

Ultrasonic irradiation greatly improved the Candida antarctica lipase B mediated ring opening polymerization of e-caprolactone to poly-6-hydroxyhexanoate in the ionic liquid 1-ethyl-3-methylimidazolium tetraflouroborate. Compared to the conventional nonsonicated reaction, sonication improved the monomer conversion by 63% and afforded a polymer product of a narrower molecular weight distribution and a higher degree of crystallinity. Under sonication, the polydispersity index of the product was 1.44 compared to a value of 2.55 for the product of the conventional reaction. With sonication, nearly 75% of the monomer was converted to product, but the conversion was only 16% for the reaction carried out conventionally. Compared to conventional operation, sonication enhanced the rate of polymer propagation by >2-fold and the turnover number of the lipase by >3-fold.

Item Type: Article
Additional Information: Corresponding author. Tel.: +60 379674003; fax: +60 379674178. E-mail address: suffian_annuar@um.edu.my (M.S.M. Annuar).
Uncontrolled Keywords: Lipase; Polycaprolactone; Polyhydroxyalkanoates; Ultrasound; Kinetics; Biopolymers
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Divisions: Faculty of Science > Institute of Biological Sciences
Depositing User: Ms. Norhamizah Tamizi
Date Deposited: 22 Apr 2014 02:13
Last Modified: 22 Apr 2014 02:13
URI: http://eprints.um.edu.my/id/eprint/9634

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